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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35818170c744aa7761cbc6fafd56c36a9a54373b7a3fc7db489aadfe532abaf0' 
  AND token = 'wsjDHhUeVumXz39ysv4xjBn+zZUBcS6AOR8z+jko+EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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