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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd61e8e98016ff0a3c85d2240b019b19c045558156cb82a1d6a4a4b9c74ea14' 
  AND token = 'ik1oSLhXTilCM/CiqIUNAk/sI5sYS4VjxRr89DVuPB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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