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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2d183d17bc0366fd2ef1e3f156616bd36811e6cb25d73939e4d605f5b31ef1' 
  AND token = '7vskt2xQYSEucjFF8vFRAmMJubtSLg4+6wbkuqhYIpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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