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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090660dc441081713b6c618a4de62cebdf825c542b1b75bff2f7d2c9c48d3dd6' 
  AND token = 'wfgJkJCwUr6yPFCFDNrWPZJ3Z74C/1f4foxiZdTbkrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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