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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef62cba1b824f15aac834626e7e9e6171726ed8a61dc7e96893518920f710c20' 
  AND token = 'BIYxTLf/8aBqabGC6TPl3waD49imE10BYrbk4mJ5hNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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