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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8892e6b4522da5a009afb0a9134e7737738e3d34050105cd276c0ee25e4c927d' 
  AND token = 'Ei4x5/QR7ZCd/gbEMnWBlc38COXG2tzD7/X2chHGY5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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