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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d8cff42803480c74382f007ea2613ec27ebc34020e8333631fc56817a74f68' 
  AND token = 'zPTjKfpRXvDAR23FcTl1GfwMpkYlo9cmxPaJCr20RLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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