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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8c2818b4708792f778e1bd33ea839657fcadd23e0b3758d08483a4519e7712' 
  AND token = 'jsjEkJiiYPpLWnA4EzczH1BfB3M96zjCKinG+L7kmss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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