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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17407c3a4cf978e74baabeb0cc27d3f5bd90c12b36c5f122d9b79c67b12a8eee' 
  AND token = 'hZeGbPDW7ZyZA+uY/7Pg+9suf2kFu+DPAjIR/DuIuZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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