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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c3587bff76ac33a8d3bedec1999bc83f1022a1e46d428b9fe483088819624d' 
  AND token = '06fArpoOsqEd8sQEx7J6H9Bo4ZZ6hmAN3c/ZUdfZCbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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