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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8312a60a9fdc8e1cce63bebe76f783b7976292d034fc78a73735b69df4d1b05b' 
  AND token = 'FQgX+2NW25oAdWpz+EcdZm21KxCzWIUHASpGUrLgeNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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