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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e0da4ed488be29d83d2a01bcb89c6a4cfa41677ee9511ffb6bf742ca82fdff' 
  AND token = 'yIyql9bTUB4pNPILDbHovVrv9cJEtCNts1ZulqTM1Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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