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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d9bfe54877a3e116eba684e8dabbd46b63c2536dd7375f9184a26857afc35d' 
  AND token = 'Ks7RW9/bCARfbJT2qEbd4F/qu8asS6uz1Hj4wO8VxCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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