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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2698c8f43a0c78fe5f93b1fbc9925d71cda6afb2d47e5524e5fe847bb4529e02' 
  AND token = 'MFAieaJulUqx+S45S8291esSGWWdap0N+e2085xWcPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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