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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ab9276114266bf3c9107adde46c10146a0e81b2350863f7fbe24ee0916568d' 
  AND token = 'aQXWZHfOZ0r4bBrtBu1SQ+c1ydHvVPQe7W7ub54pp6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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