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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b97a2935822251686db5da0cf44c9b9386332980c51f67b075b324ef605877' 
  AND token = 'LtJWgRZmW0RX8QvviJR3l0pOWlq5iX3Rlakc1z280iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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