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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5687c41f669a164f541081a0300e8fd843fb53323de370ac25f8a6c77e3263' 
  AND token = 'JfyiNt3e8XIen/dqjPbEetnAQBLuNAutDtE+nKrlOrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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