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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1693c154b7eeb647449dbfb8aa98f19c01b22dab4909c746e2247bca86439a21' 
  AND token = '2EjzjZwQlwcVAj9qmD1wQrtfTa+pi6mDR6z/YtExBt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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