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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890d9390b1f323865cfac70abe5da6e5990427cd6f553637ff1a1fce7d2dfde9' 
  AND token = 'IluNYXuTIbmQO7bagjyhVA/Iazbw69Z7MZkeyx453Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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