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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18acdd07f2948ad695cbc42a0c4e15bfb2d9759dd6708b5d7aae34f41e87122' 
  AND token = 'xg60eP/mtwKVq/Qpv0tXt2984ourT45uq+na5P0yA5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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