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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e5d5f5d161bb1b88e5c642ecf812de692fe021e0ed583f75c0c7bcbea9dffc' 
  AND token = 'QRF1oEH0j0eRnvRkS78s+eO+69zBlLZVAMrsYfSWohg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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