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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ed77daedfd1d8313c1c985ee6f5fd08c324e1633da0a153f8dc6c7c8786248' 
  AND token = 'B8ilSjaci350kP+PcxKZczI9KzotSB3n8BosFsRPPTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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