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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bd046b673ec1362a91e55deeefc055c6f05022c79504ecc5987fdf74783f0f' 
  AND token = 'qP1o5abm6ABPOqQixc2ewPFtgujPCuGK0BIV+DdZCCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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