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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024736c16ed7b2c2929c7e5d2b12541e9c23aab3aadba9890120ecfd246d5a94' 
  AND token = 'w7LrqFP+YLmmOriy01DMDxwj91xhjquzuTU8VUSPcgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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