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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685915fa6e74c5c071b63b1b808863a35ee10143f75ed33714f8b75d667570ec' 
  AND token = 'coqqV55QTqYWKvbfLrnwEI9DoroAA1tfWgJo8TGQuC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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