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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed802a9a3caa1f0bc6e8f418207fcc55de4ec1d8464639bc4e6dc0fb00abdf7' 
  AND token = 'JFhni1bAqoQ+kGsLtCPlCJ0xI5TZLEIMkJKS5/N54wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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