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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02a632ca5fa09601b299d2799403731e66ae5fd94c2e1b42ca04e5c26ccf575' 
  AND token = 'GZCwflhw2ToK8xnzHbbAAAIt9sdHYDOiS5eSHEs6sKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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