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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119c676f559b7b2475ded7415ee2d4797e034b82ce8c8f3a1b37c47899e0f64c' 
  AND token = 'kUPRgSTItX3vSGM4XISKSmfn40nKo9d9sBDaAYMTMCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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