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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40a20f3c0822df45f929ff2a038b0e438799b71b367abfb25c18af36b05ef35' 
  AND token = '48qNfWHOOy4l1BLrLWn1gs87TI+pnZH/gWFspuyRNfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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