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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f284152419a1c2eabcd898f563d0199cd98782a84038696c37162e0918dc41' 
  AND token = 'XT1M/NkLvHznPmCAw09MdqtDZfxCBFl2ol+iz332pbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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