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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8f0c9c1ae3e00599fbe864f9eaa2a7c6fcaa6d51c0ea75ea98a339ce7e4fba' 
  AND token = 'hhVCL7zOXewRbRSRPDDcKHZA3IWX7QiqYIsa3epPsDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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