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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27137b334d4063277549b6a22b67424ed6ca8ac5fa6e0ca1eb1a43d5eeffb7e' 
  AND token = 'HxniwLeWYazurI1neTU+OL2SfpkKpsWauCBB/08akp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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