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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4aa03524cd27b3713d99c9119ec73dd4477ae58f5ffbed9c1340501ec1484c' 
  AND token = '9UxvfZ7v/sFP28iCjpYA4bEq7pvyjO6eLbrv9cuhqqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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