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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb3fbf6ad24d51df2c3ede7ae98fb8aa4f4d46ebd228a05bd05e9e92ba782a7' 
  AND token = 'sleH9jqOcQY9sxnbvuscR4jtPA+KTu1bxt3ZzQykbrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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