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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb82557ecf5a0bdabb62c416526a445f2a124583c3d9e2c0a1c8abf16c13ad63' 
  AND token = 'nEDIt+lCBwU8zCjH7SLUfZ7Woei/HOv9wnOL3eb8GoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}