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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2c3f73e56c1d3796880bbfefa22c9e830e358f405ec32928538d30a22d9ef4' 
  AND token = 'i39vGkQaBdAIO5zb7MdF8Iq+4FDAx2daaE9M8whO3tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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