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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086bf73f491d898d3a5446c42192481b68051032b1f95091daf3bb1434d5ead0' 
  AND token = 'Vn4Q0A61IeaIteYo/oOeHy9Vg3J4sbULaS+/fdvLEzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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