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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f34e6f3bdb42bf6d5d64ed1721713afdc512df037e7a8777d150a09f598706' 
  AND token = '/PqKn844yr/HZ+fcNa0uiHD7+2cyntZ6agDwPW/h3k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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