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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3eaff69f597ef237929a3a7dc2e644f297c17c87db75abe69bf4eb1b71ae417' 
  AND token = 'uaAH8WtU+CWAuHkDAsBKye7mXj9JMypWXp51UpuYir0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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