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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92491d026ff93c66ec29416dd9bd337413a9a53d8702e639ce7052ff5c6fe47b' 
  AND token = 'tQY+kaAebaDWDMXF+Nh5sibJvCf1HlE+tmnmnEy75M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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