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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6fae21ada1ed626684d8a1aee4b799a3c20350817eb4c79e43c5c9fea9d02a' 
  AND token = 'F38Ft9dXUPz4D1Of67HMuUl05z8EHSOl/rdeEZOm/q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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