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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79f87dc2ef86858c5b4e8460839a386d8f3d5599329e9931c30e69a23d5a2f7' 
  AND token = '8j+N7U1IJKTJL98yUFDbTw/zo9zNKxmSCJzIUoRcKSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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