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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fb87c39b2cee6dd3d48b1b1f6fd9f9ee128dc55a6a32ddc93788ece8e0d613' 
  AND token = 'O5Bt9RPqfcK4Lw5ccUFGLk1o7LdUjiDuB64PBQojd1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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