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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017f44d0945be81599edda59cd2332b6dfdd11ccb3e16d849f608c244b238e32' 
  AND token = 'PAHdWvISeV51y+hI3TQawbUS8Glm1aoK73D2y2W879M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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