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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ee3b305bc6eef740ec559d8363fc88d84277cabbfd8e3892c2df9b4068f4b1' 
  AND token = 'IMsZoPbnmOloBu98wVP7nNRSlQ+JAa0U0elppHJBdD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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