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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bfff7bd1c0dc83c8d38563930c4714a717ef8f1cb08aed89ebf1c5135e1feb' 
  AND token = 'x32rigIF2QhSviq5U0IUcooQ26w/GgKHqZKsrx1ddRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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