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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd706ba912eb03055da6bae784b1a425a314b72fd509cd38bd3d5f2e12ec8a2' 
  AND token = 'J0oR3+2k6Oqr0CBSIzpacBTJRorihjebdRHa90P6l00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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