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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7547f0a94ee34f5018636317e2d89f2b2b94122bfeefe27abfc267fa1cdc33e' 
  AND token = '5nMhuJZvKb6e0S0hz1qmAlkvBTkcLWK/Tqgfjizsex0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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