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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dc432bd8d3e1099f794ee43e8e3412d34fd22e076719395e163c719c837e37' 
  AND token = 'ekopwVELxQ0Da/UPHwDc9Q0SFuBICt8yeXH6xiq8Hvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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