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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee4e978471eeef8aac2ab5c3f33da2e0ef639f5436c268e0fe938308a2ceaa2' 
  AND token = 'LzWXyV4woZFfUicos5GPRTderZd40bRp5VWu9Hs3QFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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