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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9d7476cb56f6ece7647dd6000dad2e5cb3976babebc9f26135ed64f9025b49' 
  AND token = 'kFcJo6onQ87U6DcG91B2oi0vDLsq/xs2yzd9Lj97j+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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