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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056a87ce3e41f7c7f05ba59ce07102bf49cb5a8ec3b06f4b1a86dcec283eeb52' 
  AND token = '84TtLnToAdiUxieRedTOOo8Z7z5TAfCcd681CfcPeAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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