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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3230ea7f95c8ac594e3f2a71d3cca0d73a341d4e142d97fe2ea822bd8fdaaa' 
  AND token = 'Wt8AY8mhZ9j7lgctSYg//M2q9dBvRkhhxwTPRbzDi3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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