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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfce9fcf2d3cee3fbf7837d7eb956cdd0b76b474816e004eb55afaedca93e5f0' 
  AND token = '/bWTVY+8ZuqtqptOcdxHTeoys81XkWhpNiPHgT2F8LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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