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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ed00725d1dccd584138df17a01d4abff36d74499839a9d161fe3b2c0cc8690' 
  AND token = '9eMyEXFQunK8XY6IZSf4X0mNpdU6z0ZCmQa4yl2yORg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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