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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b0c93e4508502574b0bea0fd44da0cda87e519d85876717de99ad623ff4745' 
  AND token = 'DYY/12yMFPgJJ5v7ry5Sy2uG0jxI6s3oWwJuNDhso64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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