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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1381532b191b3cae176fa1f2108280df094be87ded1957701eb482b46593025c' 
  AND token = '0Nl5xvvvz93F6jl3UVklbt1wedc1/+xV5VbZhjx9hu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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