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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f575d9362f3caf0c31cba4e9c1162974aedd02bd911255dc959ade86e2df525' 
  AND token = 'dFIsCtUdZlEMUFfBxVFsbS0abm3cG1eAtD4zqK7JOVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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