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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f668db922f67706ea6d7f20d1caacbf9ecee932ba6a52ce8cca58f96c994e9a9' 
  AND token = '/IRG+I9mK+bJT4+E2OOGWvKgsdlRJgwPF0VT1H2ORmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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