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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e2406cb9e22a40ab4866ee2cb69ebcb0af35f53cf880d23342ecd50183a22d' 
  AND token = 'XFw1cQwaYNiclbaIqy5ivP86naGi9613MsGj6UeXOHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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