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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed671259039b94f1c164baac109e0493f7c60907a7983ca400d3a9c545bdc3f1' 
  AND token = 'nCbX+VYFZrab8MvHv/neukEQnuQ6jt3KBH2FgA2O3uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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