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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1360573b3e71684ce7402c8708e939b70d6c46cc91475a9b423d5ab3514a0d2c' 
  AND token = 'xzRI56WzZtx5FUlYrnFXvgEYjwa6b5trL0cUmVO5XgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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