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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec8757c8c4d8618c2e47d8f956c014ce44543002fa899cfb3ba00b7693c2ae6' 
  AND token = 'TS1ET4XAW9jfPD7p2lSFwozYGtcnPjWsfd0QITp2p5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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