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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8dd7f43c24f87f8c6bc0d395967ed7b4f84c667928fcea48d1da041cbae884' 
  AND token = 'NB+K7upRrDze7tluqPXCBfuBh9Lpsma4jrNuikoPg+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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