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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf04dc6539ecb3b2f882167a6f6c5fa0c9e6f259e3d92fbdf89ba2ad11e03eb' 
  AND token = 'o2XSF+leg/vzkm17ZGUuboCK5Ot1cJ2eC7Bnmw+Wz6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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