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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583b4a78de06b528d29ee81133cf7f331fcfa108c505ad8dc2e678ae9c2135e7' 
  AND token = 'k2dzsJypTnY9sUg5qDT5JTGHUqQJRIqqtO2B8kUBDnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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