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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235498710c4dc0c3cf729a645a2d2acae7defed0441b0d40b9a6e45dccf4f0d0' 
  AND token = '4H5lX7cy+8Banjj7kCBXXF5qC6FlWmJ+gRIbYTgJo5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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