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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a30d7c223fa9ad98be4028c7bbce6d23f9b75f79b8f2f103a994459d831832' 
  AND token = '32BjLayJUOi6kCxDNzsmtmJsDq9fKc4NbsUL8gL6RP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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