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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd7c33effa27ccfa27b6d47414d3f1b635ef1e42f95eb15fb9cd8be4ad40460' 
  AND token = 'yeLDRZb7Pneo0NKhptbvKHVh2KRZ0o/+iPz1fAUVuFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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