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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ace14d475eaf9aa244a1a9382e9a6951bdbbc4daa9a58481f261ac197d6a98' 
  AND token = 'L3+OuApKjrKjOO74bauCpr1F0HRfqSWVtkfeJoZfoJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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