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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652f7f0a4aaa1af67a7ec63fb99a0c0202a5234d7d0765bbd1cfce3b7bf971cf' 
  AND token = 'SXDum0aFNB20G9+X8as2VV07B+GOqGM3hAlYo/TCsSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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