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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb263b58cb56bc49a5264c99eb5ecd98852fb3d7143817a3687e01fde5d4c30f' 
  AND token = 'su1CsjByiQBPya8kEVNH49QyZqfR7w69a4udhG2dvCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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